*{
  margin: 0;
  padding: 0;
}
html,body {
  width: 100%;
  height: 100%;
}
#root {
  width: 100%;
  height: 100%;
 
}
.app {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.footer {
  width: 100%;
  height: 50px;
  background: yellow;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.router {
  height: calc(100% - 50px);
  overflow-y: auto;
}
